atcomsystems.ca/forum Forums Other TDM Phone Systems Other Telephones & Systems AT&T 5830 - old model - setup

My MIL has an old AT&T 5830 phone and we need to update her speed dial numbers and have no clue how to do so. She doesn't have a manual. Any ideas?

I've done a search, and there's a new phone with this number, but this is a much older model. She's not about to buy a new one unless this breaks, so that's not an option.